It is no problem for this to fail, as I can capture the exception. But the problem is that I can't even load the file itself to begin with. The sage script I have starts by reading a plain text file, which contains a list of the problems. Like this

Note that Sage follows DLMF's (a. k. a. Abramowitz & Stegun) definitions rather that the simpler ones quoted by (the start of the) Wikipedia article. Note also that this does not implement Fresnel's $\cal{F}(z)=\displaystyle\int_z^\infty \textrm{e}^{\frac{1}{2}\pi i t^2} \textrm{d}t $ (left as an exercise to the reader ?).